Name the gas that can readily decolourise acidified solution:

Question

Name the gas that can readily decolourise acidified  solution:

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🧠 The Purple Eraser
Potassium permanganate () is a famous oxidant with a deep, royal purple color. When it reacts with a reducing agent in an acidic medium, the purple  ion is reduced to the colorless  ion.

🗺️ The Redox Route
1. The Reaction: Sulfur dioxide () is a strong reducing agent. When bubbled through acidified , it undergoes a redox reaction.
2. The Equation:
   
3. The Change: The oxidation state of Mn changes from  (purple) to  (colorless).
4. Verification: Other gases like  are not

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